From a5282718ccfc458ddd643f83f7e335b3e00e749d Mon Sep 17 00:00:00 2001 From: Sebastian Andersson Date: Sat, 9 Mar 2024 19:25:58 +0100 Subject: [PATCH] Update README --- README.md | 35 +++++++++++++++++++++++++++++++---- 1 file changed, 31 insertions(+), 4 deletions(-) diff --git a/README.md b/README.md index 6e848e5..0f72583 100644 --- a/README.md +++ b/README.md @@ -21,11 +21,38 @@ program is running. Many pages suggest connecting its VCC pin to 5V on the RPi. Don't! -It can run from 3.3V and then it won't risk destroying the RPi's GPIO pins. +It can run from 3.3V and then it won't risk slowly destroying the RPi's +GPIO pins. See [here](https://learn.adafruit.com/adafruit-nfc-rfid-on-raspberry-pi/pi-serial-port) -for how to configure a raspberry pi for it. +for how to configure a raspberry pi for it (but change VCC pin...). + + +### PN532 bug in the nfcpy module + +When using running it with the raspberry pi's mini-uart (ttyS0 as device), it works fine. +When using the other UART (ttyAMA0), I can only run the programs once. +I have to power cycle the PN532 to get them to run again. Just rebooting +the pi doesn't help. + +This seems to be due to a bug in nfcpy (version 1.0.4), +see (https://github.com/nfcpy/nfcpy/issues/186). + +A workaround that works for me is to change +`venv/lib/python3.7/site-packages/nfc/clf/pn532.py` +around line 390, from: + +```python + change_baudrate = True # try higher speeds +``` + +to: + +```python + change_baudrate = False # try higher speeds +``` + ## Preparing klipper @@ -67,5 +94,5 @@ klipper via the [Moonraker](https://github.com/Arksine/moonraker) API. This can be written via NXP's TagWriter on a phone, or better yet, use the `write_tags.py` program. The later fetches Spoolman's filaments, -shows a simple text interface where the spool can be chosen, then press -return to write to the tag. +shows a simple text interface where the spool can be chosen, and when +pressing return, writes to the tag.